/// <summary>
/// Initialize database
/// </summary>
public async Task OpenAsync()
{
LOG("start initializing", "ENGINE");
try
{
// open async stream
if (_stream is IAsyncInitialize s)
{
await s.InitializeAsync();
}
// initialize disk service (will create database if needed)
_disk = await DiskService.CreateAsync(_stream, _collation, MEMORY_SEGMENT_SIZES, MAX_EXTENDS);
// get header page from disk service
_header = _disk.Header;
// test for same collation
if (_collation.ToString() != _header.Pragmas.Collation.ToString())
{
throw new LiteException(0, $"Datafile collation '{_header.Pragmas.Collation}' is different from engine settings. Use Rebuild database to change collation.");
}
// initialize wal-index service
_walIndex = new WalIndexService(_disk);
// restore wal index references, if exists
await _walIndex.RestoreIndex(_header);
// register system collections
// this.InitializeSystemCollections();
_disposed = false;
LOG("initialization completed", "ENGINE");
}
catch (Exception ex)
{
LOG(ex.Message, "ERROR");
// explicit dispose (but do not run shutdown operation)
await this.DisposeAsync();
throw;
}
}